Method for estimating sampling clock skew based on orthogonal frequency division multiplexing system

A sampling clock and orthogonal frequency division technology, applied in the field of digital signal transmission, can solve problems such as insufficient stability and complex calculation methods, and achieve the effect of reducing implementation complexity, high estimation accuracy and stability

Active Publication Date: 2010-02-03
FUZHOU ROCKCHIP SEMICON
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  • Method for estimating sampling clock skew based on orthogonal frequency division multiplexing system

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[0019] In the OFDM receiving system, there is generally a symbol timing synchronization module to calculate the offset of the starting position of the OFDM symbol and perform compensation. In the capture state (a fixed period of time), the offset of the starting position of the OFDM symbol calculated by the symbol timing synchronization module (a positive value indicates that the timing is ahead, and a negative value indicates that the timing is behind) is accumulated to calculate this period of time The total offset points OffsetSum of the starting position of the OFDM symbol are divided by the total sampling points SampSum during this period to obtain the offset ratio of the sampling clock (a positive value indicates that the sampling clock is too fast, and a negative value indicates that the sampling clock is skewed). Slow), use it to compensate the sampling clock, and clear OffsetSum to zero.

[0020] Then it enters the tracking state of sampling clock offset estimation, a...

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Abstract

The invention relates to a method for estimating sampling clock skew based on an orthogonal frequency division multiplexing (OFDM) system. The method comprises the following steps: firstly analyzing the skew of a timed value in a period of fixed time to capture a skew value of a sampling clock, then tracking the skew of the sampling clock, and fine tuning the skew of the sampling clock after accumulating the skew of the timed value to a threshold value. The method directly uses a sign timing synchronous result for computation, reduces the realization complexity and has high estimated accuracyand stability.

Description

【Technical field】 [0001] The invention belongs to the field of digital signal transmission, in particular to a method for estimating sampling clock offset based on an Orthogonal Frequency Division Multiplexing (OFDM) system. 【Background technique】 [0002] The synchronization part of the OFDM receiver mainly includes frequency synchronization, sampling clock synchronization and symbol timing synchronization. For OFDM receivers, the sampling clock deviation will cause signal phase rotation and amplitude attenuation, destroy the orthogonality between OFDM subcarriers, and reduce system performance; at the same time, it will also cause the increase or decrease of sampling points, affecting some synchronization algorithms usage of. Therefore, the estimation and compensation of the sampling clock offset is very important in the OFDM receiving system. [0003] At present, the estimation of the sampling clock offset by the OFDM receiving system is mostly calculated according to t...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 张善旭夏海军
Owner FUZHOU ROCKCHIP SEMICON
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